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The half-life period of radium is `1600` years. The fraction of a sample of radium that would remain after `6400` years is.

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The half-life period of radium is `1600` years. The fraction of a sample of radium that would remain after `6400` years is.
A. `1/4`
B. `1/2`
C. `1/8`
D. `1/16`
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Correct Answer - D
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